Bisector



Sept. 28,1943., E. E. ELWERT BISECTOR Filed June 30, 1941 Patented Sept. 28, 194:3v

antin- BIsECTon Edward E. Elwert, Galesburg, Ill., assignor toW.

C. Dillon & Company, Inc., poration of Illinois Chicago, Ill., a cor- This invention relates in general to geometric instruments, and more particularly to an instrument for bisecting any desired angle. i

In line construction, i. e., the erectionofelectric lines or wires and their supporting poles, one of the important problems to be solved is that of accurately locating the correct placement for anchors for pole guy wires. This Work is normally done by a surveyor, since accuracy is essential in measuring for correct anchor holelocation.l Correctly locating `an anchor for the `guy wire for any particular pole is a case of ascertaining the direction of the resultant of the lines of force applied to that pole by the lines supported thereby, or of bisecting the angle between the lines of force to which the pole issubjected. Improper location of a guy Wire anchor will result in shifting of positiony of the top of the pole slackening ofthe pole lead, and subsequent fail ure under storm conditions or at any time that the line wires are overtensioned. It has been authoritatively estimated that, Where the proper sizes of pole, guy strand and anchor have been employed, 90% of all corner and other guyed pole failures is due to the anchor not having been located correctly.

A principal object of this invention, therefore, is to reduce to an absolute minimum the cost of wire and pole replacement and the interruption to service due to guyed pole failures,l while eliminating the expense and consumption of time normally attendant with accurate placement of guy wire anchors.

Another `important object of the invention isl the provision of simplified means for accurately locating the correct position for yanchors for poleguy wires without necessitating'the use of any engineering or surveying skill in the operation thereof.

A further object of the invention is the provision, in a device for bisecting any desired angle, of means for so engaging a pole as to adapt the device for the particular purpose' of bisecting the angle formed by the lines of force to which the pole is subjected.

Numerous other objects and advantages' of the invention will be apparent as it is better understood from the following description, which, when taken in connection with the accompanying drawing, discloses a preferred embodiment thereof. i

In the drawing: l

Figure 1 is a top plan viewy of. a device embodying the features of the invention;

Fig. 2 is a longitudinal section taken substantially on the line 2-2 of Fig. 1; and

Fig. 3 is a diagrammatic plan View illustratingv v which comprises a supporting memberl I2, a pair of sighting members I3, a slide member I l and ia pair of links I5. The forward end of the supporting member I2 is pointed, as indicated at I6, to enable the supporting member to be slightly embedded in a pole.

The sighting members I3 are disposed on opposite sides of the supporting member I2, and are pivotally connected therewith `bymeans of a bolt Il. As`noted in Fig. 2, washersv I8 are interposed between each .of the sighting members I3 andthe supporting member I2.V A nut I9, which may have its outer surface knurled if desired, is threaded on the bolt I'I and, together with the latter, is adapted to' clamp or hold the sighting members I3, against movement relative to the supporting member I2 when tightened. The rear end of each sighting member I3 is pivotally connected to the forward end of an associated link I5 by a rivet ZI. The rear end of each of the links I5 is in turn pivotally connected tothe rslidememb'er It by means of a screw 22 having threaded engagement with a suitable tapped aperture in the slide. These apertures are provided in vertical alignmentwith each other in the top'and bottom portions of the slide member I4. y

In the normal condition of the device, the sighting members' I3 are free to' pivot-upon the bolt I'I. As will be appreciated fromFig, 1 of the drawing, if one of the sightingmembers I3 is held stationary, and the other sighting rmember is swung about their mutual pivot I'I, the link-` age and slide connection between vthe sighting members and the supporting member I2 will'cause the latter to be moved correspondingly. Such resulting movement of the supporting member LIZ will be caused by the 1inkI5, which is associated with the sighting member that has been moved, moving the slide I4 longitudinally on the sup.- porting member. Since the other sighting member is being held static-nary, the resulting longitudinal movement of theslide I4 on the supportingmemberIZ will' cause the latter tobe swung a corresponding degree about the pivot I'I. vWhenever it is desired to retain the several parts of thedevice in any adjusted position", it is only necessary to tighten 'the nut I9. This results'in a clamping together of the two sighting members and the supporting member I2.

Fig. 3 of thedrawingillustrates diagrammatically the use` of the instant devices for its intended purpose of properly locating the-correctV placementvforrthe anchor for a pole guy wire. In this illustrationreference numeral 23 indi- `cates a corner pole for which a guy wire is to be placed,4 and the line poles which-form the angle With the corner pole 23 which it is desired tobisect are represented byl reference numerals 24.. Thepoint I 6 of the supporting member I2 is emi bedded'slightlyin the'pole 23 by tapping onthe UNITED ,smeris OFFICE rear end of the supporting member. The rear end of the supporting member I2 is held in horizontal position by one of the linemen, or other operators ol the device, the embedding of the point I 6 being just enough to keep the same from dropping down. This operator, or the other one workin-g with him. then adjusts one of the sighting devices into alignment Vwith one of the poles 24, as indicated in Fig. 3 by the broken sighting lines 25. One operator holds this first sighting member I3 in such adjusted position, the other operator similarly aligns the other sighting member I3 with the other pole 24. As has been noted, such adjustment of the seco-nd sighting member I3 will result in the supporting member I2 being swung about the pivot I?. The operator maintaining the supporting member I2 in a horizontal position will, of course, permit such angular movement thereof. Such horizontal movement of the supporting member I2 resulting from the adjustment of the sighting members I3 is the reason for embedding the point I5 in the pole 23 only a sufficient distance to keep the same from dropping down.

The sighting members I3, having thus been aligned with the lines of sight to the poles 24, the several parts of the device may be locked in adjusted position by tightening of the screw I2. The supporting member I2 in its adjusted position then indicates the correct anchor hole location 26, which may be at any desired point on the center line of the supporting member I 2, which is indicated by the broken line 21y in Fig. 3 In other words, regardless of what the particular angle may be that is formed by the lines of sight 25, after the devicel has been adjusted in the manner described, the center line 21 of the supporting member I2 will accurately bisect such angle to properly locate the correct placement for an anchor for the pole to be guyed.

It is thought that the invention and manyV of its attendant advantages will be understood from the foregoing description, and it will be apparent that various changes may be made in the form, construction and arrangement of the parts without departing from the spirit and scope of the4 invention or sacriiicing all of its material ad` vantages, the form` hereinbefore described being merely a preferred embodiment thereof.

I claim:

1. A device for bisecting any angle having its vertex dened by a vertical pole, comprising a member engageable at one end with said pole, sighting means pivotally mounted on said member and movable respectively into alignment with the sides of the angle, and links pivotally connected to said sighting means and pivotally and slidably connected with said member to move the latter in response to such movements of the sighting means into alignment with the line bisecting said angle.

2. A device for locating the correct placement for guy wire "anchors Vfor line supporting poles, comprising a member havin-g one end engageable with a pole, sighting means mounted adjacent one endof said member on the same vertical pivot and movable horizontally into alignment with the lines of force applied to the pole by the lines supported thereby, and links pivotally connected to saidsighting means and pivotally and slidably connected with said member adjacent the other end thereof to automatically move the latter horizontally in response to such movements of said sighting means to point toward the correct placement for a pole guy Wire anchor.

CTI

3. A device for locating the correct placement for guy wire anchors for line supporting poles, comprising a bar having the forward end thereof pointed for driven engagement with a pole, a pair of sighting members pivotally mounted on the same vertical pivot on said bar adjacent the v1forward end thereof, a link pivotally connected at one end to each of said sighting members and pivotally interconnected at their other ends and mounted for sliding movement on said bar adjacent the rear end thereof to automatically swing said bar horizontally about the forward end thereof in response to such movements of said sighting members to point toward the correct placement for a pole guy wire anchor, and adjustable means associated with said vertical pivot for clamping said sighting members to said bar to retain the sam-e in any desired adjusted position.

4. A device of the 'class described, comprising a supporting bar, a pair of sighting members pivotally mounted intermediate their respective ends at the same point adjacent one end of said bar, a member mounted adjacent the other end of said bar for longitudinal sliding movement thereon. and a link pivotally interconnected between each of said sighting members and said slide member, with the pivotal connections between said links and said slide member being in alignment with each other.

5. A` device for bisecting any desired angle,

comprising an elongated member having an end positionable at the vertex of the angle, a sighting member pivotally mounted intermediate its ends on said elongated member and movable into alignmentr with one side of said angle, means interconnecting said elongated member and said sighting member and having a portion slidable along said elongated member in response to the aligning movement of said sighting member, another sighting member pivotally mounted intermediate its ends on said elongated member and movable into alignmentwith the other side of said angle, and means interconnecting said elongated member and said other sighting member and operable in response to the aligning movement of said other sighting member for aligning said elongated member with the bisector of said angle when said other sighting member is aligned with the said other side of said angle.

6. A device for bisecting any desired angle, comprising an elongated member having an end positionable at the vertex of the angle, a sighting member having' a pivot intermediate its ends on said elongated member and movable into alignment with one side 0f said angle, means interconnecting said elongated member and said sighting member and having a portion sldable along said elongated member in response to the aligning movement of said sighting member, another si-ghting member secured intermediate its ends to the pivot of the first said sighting momber on said elongated member and movable into alignment with the other side of said angle, means interconnecting said elongated member and said other sighting member and operable in response to the aligning movement of said other sighting member for aligning said elongated member with the bisector of said angle when said other sighting member is aligned with the said other side of said angle, and clamping means at said pivot for clamping said sighting members and said elongated member together releasably to retain them in any adjusted position.

- EDWARD E. ELWERT. 

